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J.Dubell - 2009

Available Bore Dimensions

nominal

nominal

standard

optional

Tool #

bore dia.

groove dia.

typical chamberings

groove count

groove count

1

.217

.222

22 Rimfire (non magnum)

2

.219

.224

221 Fireball, 223 Remington, 220 Swift

4

7

3

.237

.243

6mm BR, 243 Winchester, 6mm Remington

6

4

4

.250

.257

25-35 WCF, 250 Savage, 25-06 Remington

6

5

.256

.264

260 Remington, 6.5-284 Norma, 264 Winchester Magnum

6

6

.270

.277

270 Winchester, 270 WSM

6

7

.277

.284

7x57mm Mauser, 280 Remington, 7mm STW

6

8

.295

.300

300 Rook

6

9

.300

.308

30-30 WCF, 308 Winchester, 30-06 Springfield, 300 WSM

6

4

10

.303

.311-.314

303 British, 7.62x39mm, 32 H&R, 327 Federal

6

11

.305

.318

8x57mm J

6

12

.315

.320-.323

8x57mmJS, 8mm Remington Magnum, 32 Winchester Special, 32-40

6

13

.330

.338

338 Federal, 338-06 A-Square, 338 Winchester Magnum

6

14

.340

.348

348 WCF

6

15

.345

.354-.356

9x57mm Mauser, 9mm pistols, 38/357 revolvers

6

16

.350

.358

35 Remington, 358 Winchester, 35 Whelen, 358 STA

6

17

.358

.366

9.3x57mm Mauser, 9.3x62mm Mauser, 9.3x74R

6

18

.366

.375

375 Winchester, 375 H&H Magnum, 375 Ruger

6

19

.373

.379

38-55 Winchester

6

20

.390

.400

10mm Auto, 40 S&W

6

21

.394

.400

38-40 WCF

6

22

.400

.408-.411

40-65 Winchester, 400 Whelen, 400 H&H Magnum

6

23

.405

.412

405 Winchester

6

24

.408

.416

416 Taylor, 416 Remington Magnum, 416 Rigby, 416 Ruger

6

25

.417

.429-.430

44 Remington Magnum, 444 Marlin

6

26

.422

.427-.428

44-40 WCF

6

27

.438

.446

44-77 Sharps

6

28

.442

.451

45 ACP, 45 Colt, 454 Cassull

6

29

.450

.458

45-70 Gov't, 458 Winchester Magnum, 458 Lott, 458 SOCOM

6

30

.466

.475

.470 Nitro Express, 475 Turnbull, 475 Linebaugh

6

31

.475

.483 or .488

475 #2 Nitro Express 3 1/2” (Ely or Jeffery)

6

32

.488

.498-.500

50 Action Express, 500 S&W

6

33

.495

.505

505 Gibbs Magnum

6

34

.500

.510-.513

500 Linebaugh, 50 Alaskan, 50-110 WCF, 50 BMG

6

35

.575

.585

577 Nitro Express, 577 Snider

8

36

.604

..614 or .621

600 Nitro Express

8

37

.688

.700

700 H&H Nitro Express

8

As soon as I get my list completed I'll post the selection of chamber reamers we have on hand.

Gear Generated Twist Rates Available

Clearwater Rifling Machine Change Gears

gear

rifling pitch

gear

rifling pitch

teeth

(actual)

(rounded)

teeth

(actual)

(rounded)

30

5.89

77

15.12

31

6.09

6

78

15.31

32

6.28

79

15.51

33

6.48

6.5

80

15.70

34

6.67

81

15.90

16

35

6.87

82

16.10

36

7.07

7

83

16.29

37

7.26

84

16.49

38

7.46

7.5

85

16.69

39

7.66

7.7

86

16.88

40

7.85

87

17.08

17

41

8.05

8

88

17.27

42

8.24

89

17.47

43

8.44

8.5

90

17.67

44

8.64

91

17.86

45

8.83

92

18.06

18

46

9.03

9

93

18.26

47

9.23

94

18.45

48

9.42

9.5

95

18.65

49

9.62

9.6

96

18.84

50

9.82

97

19.04

19

51

10.01

10

98

19.24

52

10.21

99

19.43

53

10.40

10.5

100

19.63

54

10.60

10.6

101

19.83

55

10.80

102

20.02

20

56

10.99

11

103

20.22

57

11.19

104

20.42

58

11.39

105

20.61

59

11.58

11.5

106

20.81

60

11.78

107

21.00

21

61

11.97

12

108

21.20

62

12.17

109

21.40

63

12.37

110

21.59

64

12.56

12.5

111

21.79

65

12.76

112

21.99

22

66

12.96

13

113

22.18

67

13.15

114

22.38

68

13.35

115

22.57

69

13.54

13.5

116

22.77

70

13.74

117

22.97

23

71

13.94

14

118

23.16

72

14.13

119

23.36

73

14.33

120

23.56

74

14.53

121

23.75

75

14.72

122

23.95

24

76

14.92

15

The twist rates in the highlighted boxes are what we are currently working with. If you decide your project needs one of the others (non-highlighted) we can aquire the drive gear at an additional charge. See notes below about twist rates slower than 1:22

On our Rifling machine the twist rate is generated by a gear and rack system for twists from one in seven inches to one in twenty-two inches. For slower twist rates we are able to set up a sine-bar attachment and work out to some very slow twist rates. We have cut 1:120 on a couple of projects, and of course we can handle the standard twist rates for black-powder cartridge guns and muzzle loaders as well. There is an additional charge to set up for the slower twist rates as more time is required to install the sine-bar attachment and set it for each project.